Upload pic problem in version 2.2.3 / PC settings? (1 post)

Since upgrading to the version 2.2.3 I get a strange error when uploading pics. The error however occurs only at my home PC (not at work), so something on my PC must interfere with the upload function?!

I can upload the first pic without any problem but when I click on "upload" for the second pic I get an empty upload form instead of the insert picture dialog.
The second pic is not in the upload folder on the server.
Only when I save the article and open it anew I can add a new pic - but only one again.

Occasionally I get error messages like this:

Warning: imageantialias(): supplied argument is not a valid Image resource in /home/adminmu/public_html/wp-admin/admin-functions.php2274

Warning: Division by zero in /home/adminmu/public_html/wp-admin/admin-functions.php2294

Warning: Cannot modify header information - headers already sent by (output started at /home/adminmu/public_html/wp-admin/admin-functions.php:2274) in /home/adminmu/public_html/wp-includes/pluggable.php on line 341